Large means?
Small means?
To me I'd use small = I can step over it, large means I cannot step over
it .. so ~1.1 metres is the line between the two.
On 30/01/19 19:56, Eugene Podshivalov wrote:
Here is a summary of the discussion to check if there is a consensus.
Current definitions of artificial waterways are unclear and ambiguous.
Some people assume that ditch and drain differ mainly in size, others
differentiate them mainly on liquid type (can or cannot carry
industrial discharge), others rely on lined or unlined characteristic.
It is suggested to resolve the ambiguities by updating the definitions
as follows.
canal - Large man-made open flow (free flow vs pipe flow) waterways
used to carry useful water for transportation, hydro-power generation,
irrigation or land drainage purposes. Consider using waterway=ditch
for small irrigation or land drainage channels. Consider using
waterway=drain for small usually lined superflous liquid drainage
channels.
drain - Small artificial free flow waterways usually lined with
concrete or similar used for carrying away superflous liquid like rain
water or industrial discharge without letting it soak into the ground.
Consider using waterway=ditch for unlined channels used to drain
nearby wet land. Consider using waterway=canal for large unlined land
drainage channels.
ditch - Small artificial free flow waterways used for irrigating dry
land or draining wet land. Irrigation ditches can be lined or unlined,
drainage ditches are usually unlined to let water soak through the
land into them. Ditches may have short lined segments at waterway
turning points or intersections with roads or paths to prevent
erosion. Consider using waterway=canal for large irrigation or land
drainage channels. Consider using waterway=drain for usually lined
superflous liquid drainage channels.
Cheers,
Eugene
вт, 29 янв. 2019 г. в 18:32, marc marc <marc_marc_...@hotmail.com
<mailto:marc_marc_...@hotmail.com>>:
Le 29.01.19 à 16:13, Eugene Podshivalov a écrit :
> How to we proceed with this topic? Should a proposal be created
or the
> wiki pages can be updated straight away by someone or myself
based on
> this discussion?
maybe it's a good idea to write a small-summary-only post
to check if there is a consensus on this, because there are probably
many participants who have dropped out given the number of emails
that
the subject has generated
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